I have a Roadtrek Zion which is based on the Promaster with the 6 cyl engine. The manual provide is great for the average user but is useless if you REALLY would like to know about your vehicle. Does anyone sell a Promaster manual worth a darn?
I found a 182 page pdf on the Ducato which is pretty similar. Gives a good idea about your Promaster. I don't remember were I picked it up. Maybe it was on here. I can PM you with a link to Dropbox if you wish !